The Collaborative International Dictionary of English v.0.48:

Urubu \U*ru*bu"\, n. [Cf. Pg. urub['u] a certain Brazilian
   bird.] (Zool.)
   The black vulture (Catharista atrata). It ranges from the
   Southern United States to South America. See Vulture.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vulture \Vul"ture\ (?; 135), n. [OE. vultur, L. vultur: cf. OF.
   voltour, F. vautour.] (Zool.)
   Any one of numerous species of rapacious birds belonging to
   Vultur, Cathartes, Catharista, and various other genera
   of the family Vulturidae.
   [1913 Webster]

   Note: In most of the species the head and neck are naked or
         nearly so. They feed chiefly on carrion. The condor,
         king vulture, turkey buzzard, and black vulture
         (Catharista atrata) are well known American species.
         The griffin, lammergeir, and Pharaoh's chicken, or
         Egyptian vulture, are common Old World vultures.
         [1913 Webster]